Convertible self-contained cooling unit for air conditioning



May 14, 1963 1'. c. BRANDT CONVERTIBLE SELF-CON TAINED COOLING UNIT FORAIR CONDITIONING Filed Sept. 25, 1961 BVM/(M H\S ATTORNEY United StatesPatent 0,..

Y 3,089,315A Patented May 14, 19163 3,089,315 CONVERTIBLE SELF-CONTAINEDCOOLING UNIT FOR AIR CONDITIONING Theodore C. Brandt, Whitehouse, Tex.,assignor to General Electric Company, a corporation of New York FiledSept. 25, 1961, Ser. No. 140,522 4 Claims. (Cl. 62-326) The presentinvention relates to air conditioning a-pparatus 4and more particularlyto an improved arrange-v ment for a self-contained cooling unit whichmay be quickly and easily converted at the site of installation toprovide air discharge from the unit either from the upper portions orthe lower portions thereof.

Because of the various types of house construction used today, it isnecessary to provide air conditioning and heating apparatus that may bemounted or installed in a variety of diiferent ways in order to handlethe various heating and cooling problems presented by the particulartype of house construction. For example, some houses are built withoutbasements and utilize air ow to the various rooms of the enclosurethrough ducts located in the attic of the structure. In such as case itis necessary to mount the conditioning unit above the floor level of thehouse and to circulate the air from the unit upwardly into the lductwork While receiving the recirculated air in the lower portions of theunit. This is commonly known in the industry as an upflow unit. Otherstructures without basements sometimes arrange the duct Work under thefloor of the structure and, in such a c-ase, it is necessary to mountthe conditioning unit above the door level in a manner so that the airis circulated downwardly into the duct work. Units of this type are`commonly called downow units in the industry. Other structures havingbasements and using conventional duct work located in the ceiling of thebasement, usually require that the air be discharged upwardly from aunit mounted in the basement or below the oor level of the structure.

Air conditioning apparatus of the type utilized for central airconditioning, i.e. designed to discharge its conditioned air into aplurality of ducts leading to the various rooms of the structure,normally includes a cooling unit, which cools the air discharged intothe duct work, and a condensing unit which dissipates the heat derivedfrom the structure into a source of cooling medium vsuch as outdoor airor a suitable water supply. The condensing unit usually includes -asuitable refrigerant compresor, a refrigerant condenser, and means forcirculating a cooling medium over the condenser. The cooling unitusually includes an air circulating device for blowing air through theduct work and 1a cooling unit in the form of a refrigerant evaporatorand refrigerant expansion controls. The cooling unit and condenser unitare connected by lengths of refrigerant tubing leading from the coolingunit to the condensing unit. In order to accommodate the needs of thebuilding industry many manufacturers have made two different types ofunits for each of the particula-r models they manufacture, one designedfor upilow of air and the other designed for downow of air.Manufacturing costs, of course, go up as the number of different modelsrequired by the industry go up. It has been found desirable, therefore,to manufacture but one type of unit which may be easily converted in thefield to provide the necessary air flow requirements dictated by theparticular housing structure.

Accordingly, it is an object of the present invention to provide acooling unit which may be quick-ly and easily converted from an airupflow type unit to an air downow type unit in the field.

Further objects and advantages of the invention will become apparent asthe following description proceeds and the features of novelty whichcharacterize the invention will be pointed out with p-articularity inthe claims annexed to and forming a part of this specification.

In carrying out the objects of the present invention, there is provideda cooling unit comprising a case including a back, opposite side walls,and a front wall having front opening therein. A partition meansdisposed across the case forms a plenum chamber in one end of the case.Mounted within the case is a blower unit which is arranged to dischargeinto the plenum chamber air withdrawn from the remaining portions of thecase. An evaporator unit having upper and lower ends is adapted formounting in the opposite end of the case for conditioning air drawn intothe case through an air inlet aperture located in the case adjacent theevaporator unit. In order to permit air to discharge from the plenumchamber into the duct |work of the building, located either above orbelow the cooling unit, the case is adapted for mounting in one positionwith the plenum chamber in the upper end thereof or in the invertedposition with the plenum chamber in the lower end thereof. Meansincluding an outlet aperture leading from the plenum chamber is providedAfor connecting the case to the duct work of a building. In order tosupport the evaporator unit so that it is always properly orientedwithin the case there are provided a pair of support members ararnged onthe opposite side walls of the case with one support member beingarranged substantially above the other. The evaporator unit is providedwith upper and lower brackets extending in opposite directions from theupper and lower ends of the evaporator and adapted to engage with eitherof the aforementioned support members to support the evaporator unit sothat the evaporator unit may be removed through the front opening in thecase and reinstalled in the case in its proper orientation regardless ofthe orientation of the case with respect to the building.

For a better understanding of the invention reference may be m'ade tothe accompanying drawing, in which:

FIGURE l is a front elevation view of the cooling unit of the presentinvention with portions of the front panels removed; l

FIGURE Z is a side elevation view of the cooling unit taken along line2-2 of FIGURE 1; zand FiGURE 3 is a front elevation view of the coolingunit arranged in a position inverted from that of FIGURE l to provideflow of air in the downward direction through the unit.

Referring now to FIGURE 1 of lthe drawing, there is shown a cooling unit1 of an air condition-ing system which is normally mounted within ahouse or building structure and connected to the duct work of the houseor building for circulating conditioned or cooled air into the lVariousrooms of the structure. As is well known in the art, the cooling unitcomprises only one portion of the total air conditioning system. Theother major portion being the condensing unit which is sometimes mountedoutside the house `and exposed to outdoor air, or other cooling mediumsuch as Water, for cooling the refrigerant condenser of the system. Itshould be understood, however, that it is not always necessary to mountthe condensing unit outside of the house or building. It could veryeasily be mounted Within the structure in t-he same general location asthe cooling unit or in some desirable location to which air from theoutdoors can be easily circulated. |It Will also be understood that -thecondensing unit and the cooling unit are connected by suitable4refrigerant tubing for carrying refrigerant between the components ofthe refrigeration system.

The cooling unit 1 comprises an upright case 2 generally having agreater height than width or depth. The case is normally metallic andcomprises a rear wall 3,

side walls 4 and l6 and a front wall 7, which is usually provided withone or more panels which may be removed in order to gain access to thecomponents within the unit through a large front opening 7a in the case.In order to prevent swea-ting of the case, it is usually provided withinsulating material which covers the inner surfaces of the case andprevents heat transfer from the air within the case to the metal sidewalls and top thereof. As may be Seen in FIGURE 2, an upper panel 8 isheld in place by a flange ,11 in the upper end of the case 2 and flange12 on the crosspiece 15 extending vertically across the front side '7 ofthe case 2. More specifically a pair of anges 13 and 14- on the frontpanel 8 mate respectively with the anges 11 and 12 and secure the frontpanel into place. A certain amount of spring tension is provided in theflanges so that the front panel 8 is solidly retained in place by springaction when positioned on the front of the case so that it does notrattle or vibrate during operation of the unit. Similarly, the largelower panel 9 is retained in place by lower ange 1,6 of the crosspiece15 and the flange 17 on the bottom front of the case (as seen in FIGUREl) which mate with ilanges 18 and 19 respectively of the lower panel. Itmay be desirable to attach the panel members 8 and 9 by means of springlatches of the type well known in the art to retain the panels in placewithout undue vibration.

As may be seen in FIGURE 2, the case 2 is divided by means including ahorizontal barrier or partition 21, into a plenum chamber 22 in one endof the case and a cooling or machinery compartment 23` in the remainingportions of the case. The partition 21 is secured at t-he front of thecase to the crosspiece 15. Part of the region above the partition 21, asseen in FIGURE 2, is separated from the plenum chamber 22 by a verticalpanel 2t! and thereby forms a small electrical control compartment 25adjacent the plenum chamber. The electrical control compartment 25 andthe machinery or lower compartment 23 are accessible from the front oflthe unit by removing the upper and lower front panels 8 and 9respectively.

Within the compartment 23 of the case there is mounted a blower unit 24and an evaporator unit 26 substantially one above the other. Morespecifically, the blower unit 24 comprises the scroll 27 which is boltedto the partition 21 with the outlet of the scroll arranged to direct airinto the plenum chamber through an opening in the partition 21 adaptedto iit the outlet of the scroll. Air is withdrawn by the blower unit 24from the remaining portions of the case 2. Mounted on the scroll 27 fordriving the blower wheel (not shown) within the scroll is a motor 2S,which in the embodiment of the invention shown is mounted so that mostof the motor extends into the scroll and only a small portion thereofextends outwardly from the scroll. The blower may also be mounted in amanner well known in the art on suitable slides to permit easy removalof the blower through the `front opening in the case for servicingoperations. This is a well known manner for mounting a motor on theblower scroll and further description thereof is not deemed necessaryfor a full understanding of the invention. As may be seen in FIGURE 2,the motor 28 is connected by power supply line d to its power supply inthe electrical control compartment 25.

In order to discharge air from the plenum chamber 22 into the duct workof a building, means, including the outlet aperture 29, leading from theplenum chamber, are provided for connecting the plenum chamber to theduct work 44 of the building. The outlet aperture 29, in the illustratedembodiment, is shown in the end 30 of the case 3. However, it will beunderstood that the outlet aperture 29 may be provided at any positionin the case leading into the plenum chamber 22 and the building ductwork connected thereto. In

practice it has been found desirable to merely outline a number ofoutlet apertures on the case 3 in various positions around the plenumchamber 22 so that the outlet aperture may be cut into the case at thesite of installation. During operation, air is drawn from thecompartment 23 into the blower scroll as indicated by the arrows inFIGURE 1. This air is iirst cooled as it passes through the evaporatorunit 26 arranged in the end of the case opposite from the plenum chamberor, as seen in tFIGURES 1.1 and 2, in the lower end of the case. In theillustra-ted embodiment of the invention, air enters the compartment 23of the case through an air inlet aperture 32 which is formed on the side4 of the case adjacent the evaporator unit 26. 'Ilhe building return airduct 43 is shown in FIGURE l connected to the case for directingrecirculated air back into the case. Obviously, the inlet aperture 32does not necessarily have to be formed in the side 4 of the case but itis necessary, however, that the aperture 32 be so arranged with respectto the disposition of the evaporator unit within the case that air Howsthrough the evapora-tor unit before entering the blower unit 24.

The evaporator unit 26- includes a refrigerant evaporator or air coolingcoil 31 and is usually provided with an expansion valve 40 for expandingliquid refrigerant from condenser pressure to evaporator pressure aswell as various other appara-tus for controlling ythe iiow ofrefrigerant through the system. A iilter 5 is shown attached to theevaporator unit 26 when the unit is mounted so that air flows upwardlythrough the evaporator unit toward the blower 24. A bracket 5a attachedto the lower portion of the evaporator unit supports the ilter adjacentthe cooling coil 31 so that air entering the case rst ilows through thelter 5 before passing through the coil 31. As will be explained later onin the specification, the lter is removable so that it may berepositioned when the cooling unit is converted to a downiiow unit sothat air always ows first through the -ilter 5 prior to entering thecoil 31. The iilter 5 removes much of the dirt and lint from the airstream and prevents clogging of the evaporator coil 31.

Since the detail-s of the refrigeration system and the controls may bevaried, ythese will not be described in detail in the present inventioninasmuch as a full understanding of the operation of these controlcomponents is not essential to a full understanding of the invention.However, it will be understood that, during operation of therefrigeration system, it is necessary to have the upper end 34- of theevaporator 31 oriented as shown in FlGURE l and the lower end 35 of theevaporator unit disposed in the downward direction. The lower end 35ofthe evaporator unit is provided with a condensate water collectormeans or tray 36 for collecting moisture which condenses out of the airowing through the evaporator 31.V Water flows down the coil 31 into thetray 36 disposed on the lower end 3S of the unit and this water iscarried from the drip tray 36 into suitable drain conduits leading fromthe unit. More specifically water is carried from lthe drip tray 36 bymeans of a conduit 37 which may be connected to suitable drain meansdisposed on the outside of the unit. Conduit 37 passes through `the case21 through any suitable opening or hole made in the case below the levelof the drip tray 36.

As was mentioned previously, the evaporator 31 is connected to thecondensing unit by means of suitable tubing which is inserted into thecase 2 of the unit through suitable openings, in the sides or top andbottom of the case such as the openings 45 (Shown only in FIGURE 2)provided in the rear side 3 of the case. After the tubing from thecondensing unit is inserted into the case, the openings 45 are sealed bysuitable means or collars so that air may not escape from the casethrough these openings.

It will be seen upon reference to FIGURE l, that the evaporator unit 26is mounted within the case 2 for easy removal therefrom. Mostspecifically, the evaporator unit is slidably mounted within the case ona pair of support members or channel-shaped brackets, one each beingarranged respectively on opposite sides 4 and 6 of the case 2. One ofthe support members is arranged substantially labove the other onopposite sides of the case 2. More specifically the support member 38 isarranged on the -side 4 toward the central portion of the case, oradjacent the blower. More speciiically the other or second supportmember 39 is positioned toward the end 33 of the case opposite from theplenum chamber 22 or adjacent the lower end of the case as seen inFIGURES l and 2. Obviously the relative position of the support memberscould be rearranged so that they are attached to opposite sides of thecase, i.e., support member 38 could be attached in its same relativeposition on the opposite side 6` while the support member 39` islattached in its same relative position on the side 4. In this way it ispossible to permit quick adjustment of the relative position of theevaporator unit 26 so that air may be directed into the case through theside 6 if such an arrangement is desirable.

The support members 38 and 39 are disposed a vertical distance apartapproximately equal to the height of the avaporator unit 31 so that theymate with support arms or brackets 41 and 42 projecting respectively inopposite directions from the upper end 34 and the lower end 35 of theevaporator unit. ln the preferred embodiment of the invention brackets41 and 42 are designed .to slide into the support members 38 and 39 andto securely hold the evaporator unit 26 in the upright position. As maybe seen in FIGURE l, the support members 38 and 39 are of a generallyU-shape or channel-shaped construction with inwardly directed tips 46and 46a which are designed to receive the substantially square orchannel-shaped end sections of the support brackets 41 and 42. Thesupport brackets 41 and 42 are inserted into the opening at the end ofthe support channels 3S and 39 adjacent the front opening and the entirecooling coil is slid transversely into the case 2 from the front opening7a of the case. It is a simple matter to remove the avaporator unit 26merely by reaching through the opening '7a in the front of the case andsliding the evaporator unit out ofthe case 2 after all of the couplingson lthe ends of the respective tubes have been released. It will be seenthat the above-described arrangement for supporting the evaporator unitmakes the entire cooling unit convertible in the field from an upflowunit as seen 4in FIGURES l and 2 to a downow unit as illustrated inFIGURE 3.

It should be mentioned that hanging brackets 41 and 42 extendcontinuously between the upper and lower ends of the evaporator unit andclose the space between the ends of the evaporator unit and the Sides ofthe case. This prevents air from tlowing `around the evaporator into theblower unit 24 and assures that all of the air will be cooled in theevaporator 31 as it is circulated through the case toward the blower.

The unit is usually shipped as an upilow unit, which will be consideredthe normal position of the unit. When one of these units is received inthe iield and is delivered to the construction site it is merelynecessary to mount the unit in the rst position, such as shown in FIGURE1, or in the position shown in FIGURE 3 to provide either upiiow or-downow air through the unit. That is, at the site of installation, when`the return air duct 43a is to connect with the upper portion of thecase and the conditioned air duct 44a of the house is to connect at thebottom portion of the case, all that is required to convert the unitfrom an upl'low unit to a downflow unit is to slide the evaporator unitout of the case and remove the lilter 5 therefrom, invert the case, asmay be seen by the arrangement in FIGURE 3, and then slide theevaporator unit 26 back into place with the upper support bracket 41arranged in the support channel 39 and the` lower support bracket 42arranged in the support channel 38. The lter 5 is then inserted abovethe evaporator unit (as seen in FIGURE 3) into support means provided inthe end 30 of the case or in the duct work of the building. In thepreferred embodiment of the invention, the lter 5 is supported Iby abracket 47 and a spring clip `48 which permits the iilter to be easilyinserted across -the opening 32 when the case is in the invertedposition, as shown in FIGURE 3. By reversing the case, the supportchannel 39 is moved to the uppermost position in the case while thechannel 38 is disposed below, the support channel 39. The hangingbrackets 41 and 42 of the evaporator unit 26, however, are then arrangedin their normal orientation with bracket 41 above bracket 42 so lthatthe evaporator unit is always disposed to permit water to draindownwardly into the drip tray 36 regardless of the general orientationof the case 2 within building. Thus the evaporator is always arranged ina position which will permit it to function in the normal manner. Itshould be noted that the filter 5 is repositioned during the conversionof the unit from an upflow to a downow unit so that the air entering thecase is rst ltered prior to owing over the cooling coil 31.

When the evaporator unit 26 and the lter 5 have been placed back intothe unit then the front panels are replaced onto the front of the unit.It should be noted that the front panels `tl and 9 are positioned intheir same relative position on the case so that, when the case isinverted, the front panel 8' is below the front panel 9.

As mentioned previously, the unit does not necessarily have to beprovided with inlet and outlet apertures 29 and 32 in the ends 30 and 33of the case as shown in the drawings. These sometimes are cut into thecase 2 of the unit at the construction site in order to more easilyadapt the unit to the particular arrangement of the duct work within thebuilding construction. This is commonly done in all types of airconditioning installations. However, by using the cooling unit of thepresent invention it is only necessary to cut the openings in the properlocation in the case after the unit has once been mounted with theplenum chamber 22 arranged in the upper or lower end of the casedepending upon the desired direction of air flow. The only components ofthe unit that require any adjustment are the evaporator unit 26 and thefilter 5 which merely need to be removed and reinserted into the case intheir proper orientation before connecting the tubes leading to thecondenser unit and to the Water drain.

While in accordance with the patent statutes, there has been describedwhat at present isconsidered to be the preferred embodiment of theinvention, it will be obvious to those skilled in the art that variouschanges and modications may be made therein without departing from theinvention and it is, therefore, the aim of the appended claims to coverall such changes and modifications as fall within the true spirit andscope of the invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

l. A cooling unit adapted for mounting above or below the air handlingduct Work of a building for discharging cooled air into the duct workcomprising a case including a rear wall, side walls, and a front wallhaving a front opening therein, partition means in said case forming aplenum chamber in one end thereof, a blower unit mounted in said caseand so arranged and constructed as to discharge air into said plenumchamber and Ito withdraw air from the remaining portions of said case,means including an outlet aperture in said plenum chamber fordischarging air into said duct work of said building, an evaporator unitin said case having an upper end and a lower end, an air inlet aperturein said end of said case adjacent said evaporator unit, a pair ofsupport members for supporting said evaporator unit in said end of saidcase opposite from said plenum chamber, one each of said support membersattached to opposite sides of said case in said end thereof oppositefrom said plenum chamber, one of said support members being arrangedsubstantially above said other support member, upper and lower bracketsextending in opposite directions from said upper and lower ends of saidevaporator unit, each of said brackets adapted to engage with either ofsaid support members to removably support said evaporator unit Withinsaid case so that said evaporator unit may be removed from said casethrough said front opening therein and be reinstalled into said casewith said ends of said evaporator properly oriented regardless of theorientation of said case.

2. A cooling unit adapted for mounting above or below the air handlingduct work of a building for discharging cooled air into the duct workcomprising a case including a rear wall, side Iwalls and a front wallhaving a front opening therein, partition means in said case forming aplenum chamber in one end thereof, a blower unit mounted in said caseand so arranged and constructed as to discharge air into said plenumchamber and to withdraw air from the remaining portions of said case,means including an outlet aperture in said plenum chamber fordischarging air into said duct work of said building, an evaporator unithaving an upper end and a lower end and being removably mounted 'withinsaid case in vertical alignment with said blower unit, an air inletaperture in said case adjacent said evaporator unit, a pair of supportmembers for supporting said evaporator unit in said end of said caseopposite from said plenum chamber, each of said support members beingattached to opposite Sides of said case, one of said support membersbeing arranged substantially above said other support member a distanceapproximately equal to the height of said evaporator unit, upper andlower brackets extending in opposite directions from said upper andlower ends of said evaporator unit, each of said brackets adapted toengage with either of said support members to removably support saidevaporator unit Within said case so that said evaporator unit may beremoved from said case through said opening therein and after invertingsaid case be reinstalled into said case with said ends of saidevaporator unit properly oriented for operation of said evaporator unit.

3. A cooling unit adapted for mounting above or below Ithe air handlingduct work of a building for discharging cooled air into the duct workcomprising a case including a rear wall, side walls, and a front `Wallhaving a front opening therein, partition means in said case forming aplenum chamber in one end thereof, a blower unit mounted in said caseand so arranged and constructed as to discharge air into said plenumchamber and to withdraw air from the remaining portions of said case,means including an outlet aperture in said plenum chamber fordischarging air into said duct work of said building, an evaporator unitremovably mounted in said end of said case opposite from said plenumchamber, an air inlet aperture in said end of said case adjacent saidevaporator unit, a pair of channel shaped support members for supportingsaid evaporator unit in said case, each of said support members beingattached to opposite sides of said case with one of said support membersbeing arranged above said other support member a distance approximatelyequal to the height of said evaporator unit, upper and lower supportbrackets extending in opposite directions from said upper and lower endsof said evaporator unit, said brackets having square shaped ends thereonadapted to mate with and slide into either of said channelshaped supportmembers through said front opening in said case so that said evaporatorunit may be removed from said case through said front opening thereinand be reinstalled into said case with said upper `and lower ends ofsaid evaporator properly oriented regardless of the orientation of saidcase.

4. A cooling unit adapted for mounting above or below the air handlingduct work of a lbuilding `for discharging cooled air into the duct workcomprising a case including a rear wall, side walls, and a front wallhaving a front opening therein, partition means in said case forming aplenum chamber in one end thereof and a machinery compartment in theother end thereof, said case being adapted for mounting in a normalposition with said plenum chamber disposed above said machinerycompartment and mounted in the inverted position with said plenumchamber disposed below said machinery compartment, a blower unit mountedin said machinery compartment and so arranged and constructed as tocirculate a stream of air from said machinery compartment into saidplenum chamber, means including an outlet aperture in said plenumchamber adapted to discharge air into the duct work of said building, anevaporator unit removably mounted in said -machinery compartment andhaving an upper end and a lower end, said evaporator unit including arst filter support means for supporting a lter across said evaporatorunit on the downstream side thereof when said case is disposed in saidnormal position, an air inlet aperture in said machinery compartmentadapted for connection to the duct work of said |building for thecirculation of air to be cooled into the said machinery compartment,said air inlet being so arranged within said compartment that airflowing into said compartment iirst iiows through said evaporator unitbefore entering said rblower unit, second iilter support means adjacentsaid air inlet opening for supporting a ilter across said inlet opening,a pair of channel-shaped support members for supporting said evaporatorunit in said case, each of said support members being yattached to anopposite side of said case with one of said support mem-bers beingarranged above said other support member a distance approximately equalto the height of said evaporator unit, upper and lower support bracketsextending in opposite directions from said upper and lower ends of saidevaporator unit, said brackets having squareshaped ends thereon adaptedto mate with and slide into either of said channel-shaped supportmembers through said -front opening in said case so that said evaporatorunit may be removed from said case through said front opening thereinand be reinstalled into said case vwith said upper and lower ends ofsaid evaporator properly oriented regardless of the orientation of saidcase, and a lter adapted -for mounting in said rst support means on theupstream side of said evaporator when said case is in said normalposition and adapted for mounting in said second lter support means onthe upstream side of said Aevaporation unit when said case is in saidinverted position.

References Cited in the iile of this patent UNITED STATES PATENTS

1. A COOLING UNIT ADAPTED FOR MOUNTING ABOVE OR BELOW THE AIR HANDLINGDUCT WORK OF A BUILDING FOR DISCHARGING COOLED AIR INTO THE DUCT WORKCOMPRISING A CASE INCLUDING A REAR WALL, SIDE WALLS, AND A FRONT WALLHAVING A FRONT OPENING THEREIN, PARTITION MEANS IN SAID CASE FORMING APLENUM CHAMBER IN ONE END THEREOF, A BLOWER UNIT MOUNTED IN SAID CASEAND SO ARRANGED AND CONSTRUCTED AS TO DISCHARGE AIR INTO SAID PLENUM OFSAID CASE, MEANS DRAW AIR FROM THE REMAINING PORTIONS OF SAID CASE,MEANS INCLUDING AN OUTLET APERTURE IN SAID PLENUM CHAMBER FORDISCHARGING AIR INTO SAID DUCT WORK OF SAID BUILDING, AN EVAPORATOR UNITIN SAID CASE HAVING AN UPPER END AND A LOWER END, AN AIR INLET APERTUREIN SAID END OF SAID CASE ADJACENT SAID EVAPORATOR UNIT, A PAIR OFSUPPORT MEMBERS FOR SUPPORTING SAID EVAPORATOR UNIT IN SAID END OF SAIDCASE OPPOSITE FROM SAID PLENUM CHAMBER, ONE EACH OF SAID SUPPORT MEMBERSATTACHED TO OPPOSITE SIDES OF SAID CASE IN SAID END THEREOF OPPOSITEFROM SAID PLENUM CHAMBER, ONE OF SAID SUPPORT MEMBERS BEING ARRANGEDSUBSTANTIALLY ABOVE SAID OTHER SUPPORT MEMBER, UPPER AND LOWER BRACKETSEXTENDING IN OPPOSITE DIRECTIONS FROM SAID UPPER AND LOWER ENDS OF SAIDEVAPORATOR UNIT, EACH OF SAID BRACKETS ADAPTED TO ENGAGE WITH EITHER OFSAID SUPPORT MEMBERS TO REMOVABLY SUPPORT SAID EVAPORATOR UNIT WITHINSAID CASE SO THAT SAID EVAPORATOR UNIT MAY BE REMOVED FROM SAID CASETHROUGH SAID FRONT OPENING THEREIN AND BE REINSTALLED INTO SAID CASEWITH SAID ENDS OF SAID EVAPORATOR PROPERLY ORIENTED REGARDLESS OF THEORIENTATION OF SAID CASE.